Electric gas purifier



H. F. J. NOLZE 1,785,592

ELECTRIC GAS PURIFIER Filed May 24, 1926 2 Sheets-Sheet l Dec. 16, 1930. H. F J. NOLZE 1,785,592

ELECTRIC GAS PURIFIER Filed May 24, 1926 2 Sheets-Sheet 2 Patented Dec. 16, 1930 UNITED STATES PATENT oFricE ELECTRIC GAS PURIFIER Application filed May 24, 1926. Serial No, 111,433.

This invention relates to devices for cleaning gases by means of the electric current which, jumping over between electrodes, is designed to remove dust' particles and partitles of steam from the gas flowing along said electrodes. In electric purifiers of known types the gas is moved with the aid of a rotating gas-sucker through the vessel in which the electrodes are located, the gas be- 19 ing pressed into the conduit through which the purified gas has to be delivered.

For sucking the polluted gas through the electric purifier and for forcing the purified gas into the delivering conduits, an exhauster is used, i. e. a gas conveyor, in which the gas is propelled by vanes rotating in a casing.

This invention consists in arranging in the casing of the exhauster, which serves for propelling the gas, bafliing surfaces adjustable 20 from the outer side and connected with a suitable carrier in such a manner that they can be pushed from the outer side more or less deeply into the free space in the exhauster between the rotating vanes. Herefrom results the advantage, that the exhauster for propelling the gas can be utilized in a more or less great measure as an impact purifier for the gas. The purifying effect of the electric gas purifiers of known type depends substantially on certain physical conditions and specially on the temperature of the gas. Cooler gas is much better cleaned in the electric purifier than hot gas. When a hot gas has not been thoroughly cleaned in the electric purifier, a subsequent cleaning of the gas can take place in the exhauster by inserting baflie plates into the exhauster.

- in order to make specially effective this impact purifying by means of battle plates inserted from the outer side into the exhauster, it is necessary to simultaneously inject into the exhauster finely distributed Water. The regulating of the quantity of water to be injected depends also on the subsequent puritying in theexhauster which is still neces- The adjusting of the battling surfaces to be inserted into the exhauster, as well as the regulating of the water cocks for the inject- 60 ing means may be de ne by hand, in which electric motor not shown.

case a measuring device serves as a scale on which the actual impurity of the gas is read. A simple device of this kind is a White paper strip onto which a thin gas jet is blown. When-little impurities are contained in the gas, the paper strip remains almost white and it is coloured darker when much dust is in the gas.

For shifting the bafiie surfaces in the exhauster and for adjusting the injecting cocks measuring devices might, however, be used which influence the electric operating means.

An embodiment of the invention is illustrated, by way of example, in the accompanying drawings in which Fig. 1 shows such an arrangement with automatic adjusting means.

Fig. 2 shows in elevation an arrangement to be operated by hand.

Fig. 3 shows in top plan View a similar ar rangement to that shown in Fig. 2, with a water cooler.

InFig. 1 3 is the casing of the gas-exhauster designed for propelling the gas.

This'casing has a shaft 47 driven by an On the shaft 47 vanes 2 are fixed which are moved by the rotating shaft 47 and suck the'gas, preliminarily purified in an electric purifier, through a pipe 46 into the casing 3, to force the cleaned gas subsequently into a discharge pipe which is not shown. When the gas has not been sufiiciently cleaned in the electric purifier, it is merely necessary to make the vanes 2. rotate in the casing 3 with the revolving shaft 47.

In order to make it possible, to carry out in the exhauster an auxiliary cleaning, two devices are arranged in the exhauster 3, the one of which consists of rods 1 situated in the free spaces between the vanes 2 and projecting'horizontally from a carrier ring 29, contained in a housing located at one side of the exhauster 3. These rods are arranged in such a manner that they are adapted ts be pushed in or withdrawn from the eXhauster-casing 3 by means of two spindles 27 and 28 projecting horizontally from the carrier 29 and mounted in sleeves 24 and 22. Sprocketwheels 25 and 26 are mounted on the sleeves 22 and 24 respectively which have threads. 100

When these sprocket-wheels 25 and 26 are rotated by means of a chain 33 the spindles 27 and 28 will be drawn lengthwise and outwardly through the sleeves, by reason of the screw engagement of the spindles with the sleeves and, the rods 1 in the exhauster-casing 3 are adjusted accordingly, the carrier 29 being moved laterally by the movements of the spindles and correspondingly moving the rods 1. On the end of the sleeve 22 a spurwheel 21 is keyed, which is adapted to be rotated from the counter-shaft 19. This counter-shaft 19 is rotated by means of an auxiliary-motor 16, to which current is supplied from an electric starter 17 by means of chain 21a and sprocket wheels 22a. The switching-in of this starter 17 is efi'ected through two wires 14 and 15 and switch 8, the current-conditions of which depend on an electric-temperature-measurin device 4 built into the electric-purifier 5. s the polluted gas in the electric-purifier can be cleaned less well when it has a high temperature, but is almost completely cleaned when it has a low temperature, the temperature can be determined by the temperature-measuring-device 4 and the rods 1 pushedinto or out of the casing 3 for subsequent cleaning of the gases. Owing to the temperature-measuringdevice 4 a more or less strong current can be made to flow through the wires 6 and 7 leading therefrom, said current serving, on the one hand, to operate the indicating device 9 so that it indicates the actual temperature of the polluted gas and on the other hand causing corresponding current flow through the wires 14 and 15 into the starter 17, wherefrom it results that, through the wires 12 and 13 and through the wire 11, a correspondin current-impulse is exerted upon the auxi iarymotor 16, which is then started and'rotates,

through the gear-box 18,'the shaft 19 in the one or other direction according to the direction of the current, whereby, in the manner above described, the spindle 27'and also the spindle 28 are shifted by rotation of the sleeves 22 and-24, and eifect adjusting of the rods 1.

The second new arrangement in the exhauster 3 is the water-spraying-device 40. Water is fed to the spraying tube or tubes 14 from a water-main 38 into which water flows casing 3 from the perforated-tube 40, is thus brought into accordance with the length of which the rods 1 are pushed into the exhauster-casing 3. A very ener etic subsequent cleaning, for which the ro s 1 have to be pushed in far. requires more water from the perforated-tube 40. When the rods 1 have been completely withdrawn from the exhauster 3, the mechanism 33 to 37 shuts off completely the water-supply to pipe 38.

Fig. 2 shows a similar arrangement to be operated by hand.

Through a pipe 41 the polluted gas flows into the electric-purifier 5 which, in a manner known per se, is subdivided into a great number of compartments 56, containing spaced electrodes between which an electric current of high voltage jumps, the gas being conducted through the intervals of the electrodes, the high voltage terminals shown in Figures 1 and 2 being designated by the characters a and b. The as preliminarily cleaned in the electric puri er 5 flows through ipe 42 into the exhauster 3, the vanes in w ich are rotated from a motor 43. In the exhauster '3 the rods 1 are arranged as shown in Fig. 1, said rods being pushed into the casing by means of the spindles 22 and 24, when the chain 51 is bein pulled with the aid of the pull rope 52, an which are withdrawn from the cas ng 3 when the pull rope 52 is moreor less released. To the chain 51 the o erating lever of the cock 53 is also connecte so that through a funnel 54 and pipe 55 more water flows into the exhauster 3 when the gas has to be more strongl cleaned subsequently.

Fig. 3 shows in p an view the arrangement shown in Fi 2. The pipe 42, which conducts the gas, pre iminaril'y cleaned in the electric purifier 5, has a curved branch 44, 45 in which a vessel -62 is inserted, into which by an injecting s stem 65 water s rays are injected from above. The gas owin from pipe 44 to pipe 45 is consequently pre iminarily cooled and loaded with steam, this being very advantageous for the subsequent cleaning in the exhauster. The hand operated mechanisms shown in Figs. 2'and- 3 are to be used either as adjuncts of the operative devices shown in Fig. 1, or separately They are to this extent associated with the automatic means shown in Fig. 1 that they may be used in an. emergency or when it is inconvenient and unnecessar to use the automatic devices. It might be advisable to provide on the cage support 29, a handle 40a by means of which the in order to ena la a certain ad usting by hand of the automatic adjusting. With! this object in view certain rods and surfaces are connected with the handle so that it is not necessary to alter the adjusting of the automatic gear.

I claim:

An apparatus for freeing gas from dust and steam like im urities, comprising in combination with an e ectric gas purifier in which an electric current of high voltage jumps over from one electrode to another electro e the gas being conducted through the interval between said electrodes, an exhauster for conveyino the purified gas from said purifier, bafiie sur iaces in said exhauster, means for gage can be adjusted by hand pushing said bafiie surfaces into or withdrawmg the same from said exhauster in accordance with the temperature of the coming from the electric purifier, spraying nozzles in said exhauster for injecting water, and means for increasing the quantity of in ected water when the electric precipitator is at a high temperature and for reducing the same at low temperature.

In testimony whereof I aflix my signature.

HEINRICH FERDINAND JOHANN NOLZE. 

